Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition

Balk, A. L.; Li, F.; Gilbert, I.; Unguris, J.; Sinitsyn, N. A.; Crooker, S. A.

doi:10.1103/PhysRevX.8.031078

Title: Broadband Spectroscopy of Thermodynamic Magnetization Fluctuations through a Ferromagnetic Spin-Reorientation Transition

Journal Article · Fri Sep 21 00:00:00 EDT 2018 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.8.031078· OSTI ID:1471805

Balk, A. L.; Li, F.; Gilbert, I.; Unguris, J.; Sinitsyn, N. A.; Crooker, S. A.

We use scanning optical magnetometry to study the broadband frequency spectra of spontaneous magnetization fluctuations, or “magnetization noise,” in an archetypal ferromagnetic film that can be smoothly tuned through a spin-reorientation transition (SRT). The SRT is achieved by laterally varying the magnetic anisotropy across an ultrathin $Pt / Co / Pt$ trilayer, from the perpendicular to in-plane direction, via graded ${Ar}^{+}$ irradiation. In regions exhibiting perpendicular anisotropy, the power spectrum of the magnetization noise $S (ν)$ exhibits a remarkably robust $ν^{- 3 / 2}$ power law over frequencies $ν$ from 1 kHz to 1 MHz. As the SRT region is traversed, however, $S (ν)$ spectra develop a steadily increasing critical frequency $ν_{0}$ , below which the noise power is spectrally flat, indicating an evolving low-frequency cutoff for magnetization fluctuations. The magnetization noise depends strongly on applied in- and out-of-plane magnetic fields, revealing local anisotropies and also a field-induced emergence of fluctuations in otherwise stable ferromagnetic films. Finally, we demonstrate that higher-order correlators can be computed from the noise. These results highlight broadband spectroscopy of thermodynamic fluctuations as a powerful tool to characterize the interplay between thermal and magnetic energy scales, and as a means of characterizing phase transitions in ferromagnets.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)

Grant/Contract Number:: AC52-06NA25396; DMR-1157490

OSTI ID:: 1471805

Alternate ID(s):: OSTI ID: 1479988

Report Number(s):: LA-UR-18-22421; PRXHAE; 031078

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 8 Journal Issue: 3; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 9 works

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